These preparations are not standardized, and not all contain lead. One alternative to lead sulfide is another toxic compound, antimony sulfide. Imported cosmetics are one of the relatively few sources of significant lead exposure for infants too young to crawl or walk; however, exposure to lead in tiro represents an additional burden to groups who might be exposed to other sources of lead. The contribution that tiro might make to the cumulative burden of lead poisoning should not be overlooked.